Thermostat shows F09 and the mobile app cannot access the device remotely, even though local control works.

Safety first: Network troubleshooting only.

• Check internet connection:
  • Verify that other devices on the same network can access the internet.
• Restart network equipment:
  • Reboot the router and modem.
  • After internet is restored, reboot the Ferroli thermostat.
• Check router firewall:
  • Ensure that outbound connections are not blocked for the thermostat's IP address.
  • Disable overly strict parental controls or firewall rules temporarily to test.
• Update firmware:
  • In the Ferroli app or thermostat menu, check for firmware updates and install if available.
• If F09 persists:
  • Contact Ferroli support to confirm if there is a known cloud outage.
  • If not, they may advise advanced network settings or replacement of the smart thermostat if its cloud module is faulty.